Alright, let's work through 83840744 times 98899387 step by step
83840744 × 98899387 = 98899387 × (83840744)
+ 98899387 × 4 yielding 395597548
+ 98899387 × 40 resulting in 3955975480
+ 98899387 × 700 producing 69229570900
+ 98899387 × 0000 giving us 0
+ 98899387 × 40000 what gives us 3955975480000
+ 98899387 × 800000 which equals 79119509600000
+ 98899387 × 3000000 that results in 296698161000000
+ 98899387 × 80000000 giving us 7911950960000000

= 8291798187223928
